Taiwania

Determination of phytosociological characteristic, biodiversity conservation dynamics and biomass potentials in a Nigerian protected forest Tropical rainforest contributes immensely to the richness, diversity and productivity of ecosystem. This study aimed to determine the structure, biodiversity and carbon stocks of Okomu protected forest in Nigeria. Simple random technique was adopted in selection of 9 compartments and in each compartment 4 plots of size was selected with 36 plots of (25 m x 25 m x 36 plots), making a total of 2.25 ha selected from the entire forest. Shannon-Wiener diversity index, Shannons equitability of species evenness, Margalefs index of species richness and volume equations were used to determine species diversity, evenness, richness and tree structure respectively. There were 790 individual trees, 351 stems ha-1 belonging to 67 tropical hardwood species, 86 genera and 31 families. About 24% of tree species in this protected forest were among tree species that needs urgent conservation measures. The total volume was estimated to be from 1970.40 to 9437.76 m3 with an average of 4643.20 m3 ha-1, an indication of vertical and horizontal structure confirm the growing natural of this protected forest. Accumulation of total biomass was estimated to be from 1150.72 to 6795.20 kg ha-1 with an average of 2927.72 kg ha-1. The carbon stock in this protected forest was estimated to be from 575.36 to 3397.60 kg ha-1 with an average of 1463.88 kg ha-1. The forest serves as biodiversity hotspot due to high Shannon-Wiener index and evenness computed for the compartments. This serves as information for management of protected forests, with potentials for nature conservation and carbon sequestration.

本研究旨在探究尼日利亚奥科穆保护区热带雨林中的植物群落学特征、生物多样性保护动态及生物量潜力。该保护区热带雨林对生态系统的丰富性、多样性和生产力贡献巨大。研究采用了简单随机抽样技术，从整个森林中选取了9个样地，每个样地内选取了4个面积为36个（25米×25米）的样方，总计选取了2.25公顷的区域。本研究运用了香农-威纳多样性指数、香农均匀度指数、马加莱斯物种丰富度指数以及体积方程，分别用于确定物种多样性、均匀度、丰富度和树木结构。在所选区域内共有790棵树木，每公顷351个树干，隶属于67种热带硬木树种、86个属和31个科。该保护区森林中约24%的树种属于亟需采取保护措施的种类。估计总蓄积量为1970.40至9437.76立方米，平均每公顷4643.20立方米，这一数据表明了该保护区森林的垂直和水平结构及其自然生长的特性。总生物量的累积估计在1150.72至6795.20千克公顷之间，平均每公顷2927.72千克。该保护区森林中的碳储量估计在575.36至3397.60千克公顷之间，平均每公顷1463.88千克。由于样地具有较高的香农-威纳指数和均匀度，该森林成为生物多样性热点。这些信息为保护区森林的管理提供了依据，对于自然保护和碳汇有巨大潜力。